I am trying to select optimize but keep coming up with the same error "Only 1 UBC Case can be solved in a tension/compression analysis". I have perform analysis change after each seismic load and it ran fine before I tried to optimize the members. Does anyone have any suggestions??
The codes I tried after defining parameters were:
Perform Analysis
Fixed Group
Group...
Select Optimized (also tried "SELECT ALL")
Code Check All
Finish
I also tried:
Select All
Group Memb
Check Code
(and repeated that for 2 cycles)
I am fairly new at using STAAD and would be greatful for any help on this matter. Thank you in advance!!